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PubMed Journals Articles About "Valent Group Phosphinidenide Complexes SIDipp Exhibit Interaction" RSS

03:46 EST 9th December 2019 | BioPortfolio

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Showing "valent group phosphinidenide complexes SIDipp exhibit interaction" PubMed Articles 1–25 of 20,000+

Low valent group 14 phosphinidenide complexes ({SIDipp}P)2M exhibit P-M pπ-pπ interaction (M = Ge, Sn, Pb).

Herein we present the synthesis of novel low valent group 14 phosphinidenide complexes [({SIDipp}P)2M] exhibiting P-M pπ-pπ interactions (M = Ge, Sn, Pb), which were investigated by means of structural, spectroscopic and quantumchemical methods. Furthermore, the monosubstitued compounds [(SIDippP)MX]2 (M = Sn, X = Cl; M = Pb, X = Br) are presented, which show dimeric structures instead of multiple bonding interaction.


Synergistic effect of magnetite and zero-valent iron on anaerobic degradation and methanogenesis of phenol.

Anaerobic digestion is widely employed for treating phenol-containing wastewater, but there are still some drawbacks such as slow phenol degradation rate and vulnerable acetoclastic methanogens. Coupling of magnetite (FeO) and zero valent iron (ZVI) was firstly used to enhance anaerobic digestion of phenol. The results indicated an obvious synergistic effect was generated with coupling of FeO and ZVI during the whole anaerobic digestion of phenol. The phenol degradation rate and methane production of FeO/ZV...

Clinical effectiveness of 13-valent and 23-valent pneumococcal vaccination in middle-aged and older adults: The EPIVAC cohort study, 2015-2016.

Clinical benefits using the 23-valent pneumococcal polysaccharide vaccine (PPsV23) or the 13-valent pneumococcal conjugate vaccine (PCV13) in adults are controversial. This study investigated clinical effectiveness for both PPsV23 and PCV13 in preventing pneumonia among middle-aged and older adults.


Enhancement of methanogenic activity in anaerobic digestion of high solids sludge by nano zero-valent iron.

This study evaluated the effects of nano zero-valent iron (NZVI, 50 nm) on anaerobic digestion of high solids sludge (10 ± 0.5%). Compared to the blank group without NZVI, the group with NZVI at all levels (10, 20 and 30 mM) played a driving role in methane production. The maximal methane production was increased by 37.5% in the group of 30 mM NZVI. The dynamic changes of hydrogen content and VFAs showed that rapid hydrogen evolutional corrosion of NZVI made lower hydrogen partial pressure in the late...

Synthesis and structural characterization of arsinoamides - early transition metal (Zr and Hf) and main group metal (Al, In, Sn, and Pb) complexes.

By reaction of MCl4 (M = Zr, Hf) with 2 equiv. of [(Mes2AsNPh){Li(OEt2)2}], the first group 4 metal arsinoamide complexes [(Mes2AsNPh)2MCl2(THF)] were synthesized. They feature two weak M-As interactions. After formally replacing the chloride atoms by the amido ligands [NMe2]-, a more diverse M-As interaction arises in [(Mes2AsNPh)2M(NMe2)2]: only one M-As contact can be observed with a substantially shorter distance. This type of interaction may originate from the steric effect of the substituents on the m...

SMM Behavior Tuned by an Exchange Coupling LEGO Approach for Chimeric Compounds: First 2p-3d-4f Heterotrispin Complexes with Different Metal Ions Bridged by One Aminoxyl Group.

Coordination compounds containing three different spin carriers (2p, 3d, and 4f), with the general formula [MDy(LH)(hfac)] (M = Co, Ni, Mn, Zn), have been obtained using Mannich ligands decorated with a nitronyl-nitroxide fragment. The synthetic approach is general and leads to binuclear 3d-4f complexes, the two metal ions being bridged by one aminoxyl group and by one oxygen atom arising from a hfac ligand. Triangular spin topology affords significant 2p-3d, 3d-4f, and 2p-4f exchange interactions. For the ...

Dicyanometalates as Building Blocks for Multinuclear Iron(II) Spin-Crossover Complexes.

A synthetic strategy featuring dicyanometalates [M(CN)] (M = Ag, Au) as N-coordinating ditopic linkers connecting partially blocked Fe centers has been employed to produce heterometallic hexanuclear complexes, which exhibit spin-crossover (SCO) behavior at the Fe sites. The reaction between tris(2-pyridylmethyl)amine (tpma)-capped Fe ions and [Ag(CN)] proceeded with partial decomposition of the dicyanoargentate and led to the formation of {[Fe(tpma)](μ-CN)[μ-Ag(CN)]}(ClO)·3HO (1), in which both [Ag(CN)] ...

Influence of nanoscale zero-valent iron and magnetite nanoparticles on anaerobic digestion performance and macrolide, aminoglycoside, β-lactam resistance genes reduction.

The effect of nanoscale zero-valent iron (NZVI) and magnetite nanoparticles (FeO NPs) on anaerobic digestion (AD) performance was investigated through a series of 100-day semi-continuous mesophilic anaerobic digestions. The results indicated that biogas production had increased by 24.44% and 21.66% with the addition of 0.5 g/L FeO NPs and 1.0 g/L NZVI, respectively. Besides, the abundance of five widespread antibiotic resistance genes (ARGs) (ermF, ermA, ermT, aac(6')-IB, blaOXA-1) was also studied. The...

Impact of the interaction between alexithymia and the adult attachment styles in participants with alcohol use disorder.

The current study aims to investigate the effect of the interaction between adult attachment styles and alexithymia among participants with alcohol use disorder (AUD). This study is cross-sectional, conducted between November 2017 and March 2018, which enrolled 789 community dwelling participants. The interaction between alexithymia and secure relationship tended to significance (p=0.057). Higher interaction between alexithymia and a fearful relationship style (Beta=0.04) was significantly associated with h...

Evaluation of Chen et al.: Overexpression of Protein Complexes and Aneuploidy.

One snapshot of the peer review process for "Overdosage of Balanced Protein Complexes Reduces Proliferation Rate in Aneuploid Cells" (Chen et al., 2019).

Nitrite Reduction by Trinuclear Copper Pyrazolate Complexes: An Example of a Catalytic, Synthetic Polynuclear NO Releasing System.

Two trinuclear Cu pyrazolato complexes with a Cu(μ-E)-core (E = O or OH) and terminal nitrite ligands in two coordination modes were characterized crystallographically, spectroscopically, and electrochemically. One-electron oxidation of the μ-O species produces a delocalized, mixed-valent, formally CuCu-nitrite, but no nitrate. In contrast, under reducing conditions-addition of PhSH as an electron and proton donor-both complexes mediate the reduction of nitrite, releasing NO.

Single-Molecule Magnetism in Three Dy2 Complexes from the Use of a Pentadentate Schiff Base Ligand and Different Benzoates.

Three dinuclear DyIII complexes of formulae [Dy2L2(O2CPh)2]·2MeOH (1), [Dy2L2{(2-NO2)O2CPh}2] (2), and [Dy2L2{(2-OH)O2CPh}2]·MeOH·MeCN (3) (H2L = N1,N3-bis(4-chlorosalicyladehyde)diethylenetriamine) have been synthesized and structurally characterized. Complexes 1-3 possess similar Ln2 cores and differ in the substituents at the benzyl rings of benzoates. Dc magnetic susceptibility studies in the 2-300 K range showed weak antiferromagnetic interactions between two DyIII ions in 1-3. The alternating curre...

Interaction sites of PEF proteins for recognition of their targets.

The EF-hand is a helix-loop-helix motif observed mainly in intracellular calcium binding proteins. The EF-hand usually occurs as a pair, EF-lobe, which is a unit of evolution and structure. Penta EF-hand (PEF) proteins form a unique group including calpain, sorcin, grancalcin, ALG-2, and peflin. The fifth EF-hand of PEF proteins makes a pair with that of another PEF protein. The members of PEF family have diverse functions and their evolution is complex. The interaction of PEF proteins with target occurs at...

Controlling the Electronic Structures and Excited-State Characteristics of Dipyrrinatoiridium(III) Complexes by an Arylborane or an Arylamino Unit.

Novel dipyrrinatoiridium(III) complexes, in which a typical element substituent (i.e., arylborane or arylamino group) was introduced at the meso position of the 5-phenyldipyrrinato ligand, were designed and synthesized. The (dimesitylboryl)phenyl complex showed fascinating photophysical properties arising from a synergistic interaction between metal-to-ligand charge transfer/ligand-to-ligand charge transfer and charge transfer from the π orbital of the aryl group to the vacant p orbital on the boron atom ...

Ion-Pair Complexes of Pyrylium and Tetraarylborate as New Host-Guest Dyes: Photoinduced Electron Transfer Promoting Radical Polymerization.

Ultrafast transient absorption spectroscopy, NOESY-NMR and EPR spectroscopy shed light how π-π stacking interac-tions combined with electrostatic interactions can be used to form a stable ion-pair complexes between pyrylium and tetraarylborate ions in which the interaction of the π-delocalized clouds promotes the observation of new radiative processes and also electron transfer process excitation using visible light. The results exhibit a striking combination of properties: chemical stability, photophysi...

Through Space Spin Coupling in a Silver(II) Porphyrin Dimer upon Stepwise Oxidations: AgII/AgII, AgII/AgIII and AgIII/AgIII Metallophilic Interactions.

Metallophilic interactions between closed shell metal ions are becoming extremely popular tool for a variety of high-end materials related applications. There is no systematic investigation so far to estimate the structure and energy characteristics for metallophilic interactions between AgII/AgII (d9/d9), AgIII/AgIII (d8/d8) and also mixed-valent AgII/AgIII (d9/d8) complexes which has been demonstrated in the present study. Both interporphyrinic and inter-metallic interactions have been investigated upon s...

Application of ensemble methods to analyse the decline of organochlorine pesticides in relation to the interactions between age, gender and time.

Organochlorine pesticides (OCPs) are toxic chemicals that persist in human tissue. Short and long term exposure to OCPs have been shown to have adverse effects on human health. This motivates studies into the concentrations of pesticides in humans. However these studies typically emphasise the analysis of the main effects of age group, gender and time of sample collection. The interactions between main effects can distinguish variation in OCP concentration such as the difference in concentrations between ge...

Reaction of an arsinoamide with chloro tetrylenes: substitution and As-N bond insertion.

Reaction of the arsinoamide [(Mes2AsNPh){Li(OEt2)2}] with the low-valent group 14 compounds, [{PhC(tBuN)2}ECl] (E = Si, Ge) and GeCl2·dioxane, resulted in two different reaction pathways: simple substitution or substitution accompanied by an insertion step. As a result, either insertion products with an As-Si[double bond, length as m-dash]N unit and an As-Ge bond, or substitution products, in which the intact arsinoamide binds to the group 14 elements via the N atom, were obtained.

Unveiling a Novel, Cation-Rich Compound in a High-Pressure Pb-Te Binary System.

Because of the common oxidation states of group IV elements (+2 or +4) and group VI elements (-2), 1:1 and 1:2 are two typical stoichiometries found in the IV-VI compounds. Particularly, in the Pb-Te binary system, the 1:1 stoichiometric PbTe is believed to be the only stable compound. Herein, using evolutionary algorithms, density functional theory, a laser-heated diamond anvil cell, and synchrotron X-ray diffraction experiments, we discovered a novel Pb-Te compound with an unexpected stoichiometry of 3:2 ...

Interaction of zero valent copper nanoparticles with algal cells under simulated natural conditions: Particle dissolution kinetics, uptake and heteroaggregation.

Some metal-based engineered nanoparticles (ENPs) undergo fast dissolution and/or aggregation when they are released in the environment. The underlying processes are controlled by psychochemical/biological parameters of the environment and the properties of the particles. In this study, we investigated the interaction between algal cells and zero valent copper nanoparticles (Cu-ENPs) to elucidate how the cells influence the dissolution and aggregation kinetics of the particles and how these kinetics influenc...

Oxidation of uranium(iv) thiocyanate complexes: cation-cation interactions in mixed-valent uranium coordination chains.

Oxidation of Cs4[U(NCS)8] in MeCN or DMF affords structurally characterised examples of the mixed-valent UIV/VI compound Cs14[{U(NCS)8}3{UO2(NCS)4(H2O)}]·4.5H2O, or the [UIV-UV-UIV][UVI] species [U(DMF)8(μ-O)U(NCS)5(μ-O)U(DMF)7(NCS)][UO2(NCS)5]. Vibrational and magnetism data support their oxidation state formulism, which is further corroborated by computational methodology.

A Germylene Supported by Two 2-Pyrrolylphosphane Groups as Precursor to PGeP Pincer Square-Planar Group 10 Metal(II) and T-Shaped Gold(I) Complexes.

An efficient synthesis of 2-ditertbutylphosphanylmethylpyrrole (HpyrmPtBu2), by reacting 2-dimethylaminomethylpyrrole (HpyrmNMe2) with tBu2PH at 135 oC in the absence of any solvent, has allowed the preparation of the new PGeP germylene Ge(pyrmPtBu2)2 (1), by treating GeCl2(dioxane) with LipyrmPtBu2, in which the Ge atom is stabilized by intramolecular interactions with one (solid state) or both (solution) of its phosphane groups. Reactions of germylene 1 with Group 10 metal dichlorido complexes containing ...

Cyclotrimerization of Acetylene in Gas Phase V(CH) Complexes: Detection of Intermediates and Products with Infrared Spectroscopy.

Infrared laser spectroscopy and mass spectrometry were used to determine the structures of intermediates and products in the single-atom-catalyzed trimerization of acetylene to form benzene. Complexes of the form V+(C2H2)n were produced in the gas phase via laser ablation in a pulsed-nozzle source, size-selected with a mass spectrometer, and studied with infrared laser photodissociation spectroscopy. Density Functional Theory (DFT) calculations were performed in support of the experiments. Single- and doubl...

A Neutral "Aluminocene" Sandwich-Complex: η1 vs. η5-Coordination Modes of a Pentaarylborole with ECp* (E = Al, Ga).

A pentaaryl borole (Ph*C)4BXylF [Ph* = 3,5-tBu2(C6H3); XylF = 3,5-(CF3)2(C6H3)] reacts with low-valent group 13 precursors E(I)Cp* (E = Al, Ga). With [AlCp*]4 the borole reacts as an oxidising agent accepting two electrons. The resulting unprecedented neutral η5-Cp*,η5-[(Ph*C)4BXylF] complex of Al(III) was structurally, spectroscopically and computationally probed and revealed a strong ionic bonding interaction. The formation of the heteroleptic borole-cyclopentadienyl "aluminocene" leads to significant c...

Hydrogen Atom Abstraction by High-Valent Fe(OH) versus Mn(OH) Porphyrinoid Complexes: Mechanistic Insights from Experimental and Computational Studies.

High-valent metal-hydroxide species have been implicated as key intermediates in hydroxylation chemistry catalyzed by heme monooxygenases such as the cytochrome P450s. However, in some classes of P450s, a bifurcation from the typical oxygen rebound pathway is observed, wherein the Fe(OH)(porphyrin) species carries out a net hydrogen atom transfer reaction to form alkene metabolites. In this work, we examine the hydrogen atom transfer (HAT) reactivity of Fe(OH)(ttppc) (), ttppc = 5,10,15-tris(2,4,6-triphenyl...


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